9 Digits is 1 Billion and 10 digits is 10 billion
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No. When adding the smallest 2 digit number (= 10) to the smallest 2 digit number (again, 10) the result is a 2 digit number (10 + 10 = 20). When adding the largest 2 digit number (= 99) to the largest 2 digit number (again, 99) the result is a 3 digit number (99 + 99 = 198). As you can see, you'll either get a 2 or 3 digit number, but never a 4 digit number.
It is called a 28-digit number!
The units digit of a two digit number exceeds twice the tens digit by 1. Find the number if the sum of its digits is 10.
A quintillion is a number with 18 zeros (19 digits). A 20-digit number would be 10's of a quintillion (20 digits since we add one more digit to the left).
10 is the lowest two digit number.